Spectroscopic studies of interactions of polyaniline with some Cu(II) compounds

The incorporation of planar Cu(II) complexes as dopants into ES-PANI through an ion-exchange process was investigated by spectroscopic methods. A decrease in the intensity of the EPR signals from polarons in Cu(II) complex-doped PANI samples was observed, while the Cu(II) anion concentration increases and favors the formation of bipolarons in Cu(II) complex-doped PANI systems. A large influence of the copper complex counterion or the solvent on the conductivity in the PANI samples after ion-exchange has been observed. The reactions of EB-PANI following different levels of reduction or HCl doping with CuCl2 aqueous solution are also investigated and new reaction mechanisms are proposed.